新概念4第13课句子分析oncewegetdowntotheoil,itusuallyflowstothesurfacebecausegreatpressure,eitherfromgasorwater,ispushingit.最后的ispushingit的主语是什么?复制搜索

Question

新概念4第13课句子分析
once we get down to the oil,it usually flows to the surface because great pressure,either from gas or water,is pushing it.
最后的is pushing it的主语是什么?
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Answer 1

我就分析一下最后那个原因状语：
great pressure,either from gas or water, is pushing it.
主语 后置定语（修饰主语） 谓语 宾语（指oil）